They're probably a little more sturdy then the MoFi's but def. not nearly as sturdy as Sleeve City Audiophile inners since those have the paper laminate on both sides and are nearly indestructible. Those are my favorite inners I have ever bought but they're also nearly $30 (+ shipping) for a 50 pack.. So basically 100 of those SC sleeves cost the same as 500 of the Hudson's (I only paid $30 for 500 inners and a 100 outers last year which made it an even easier decision). For me at least, the Hudson's are more then enough and not worth spending 5x's as much.
I'd say if you don't mind spending more for the SC sleeves and didn't like the Gotta Groove or MoFi inners you probably aren't going to love the Hudson's.